Humans. 

 #mine:photoset   #Doctor Who   #I really love this PSD a lot okay   #Also that first gif was being annoying   #Eleventh Doctor   #But can I just talk about this gifset for a minute though?   #The Doctor treats Earth and the human race as his second family of sorts   #He travels almost entirely with humans and he spends quite a lot of time on earth   #He loves humans and has made that very clear   #Especially during The Eleventh Hour when the Atraxi questions him about Earth   #And he says No but I've put a lot of work into it or whatever it was   #So it's really curious to see how the Doctor's character has evolved over time   #In Eleven's beginning he was still a bouncy little puppy   #He loved everything and particularly his curious little humans   #But as his character continues to grow I guess he starts to become more weary?   #I'm not really sure what it is but there is a noticeable change in his character   #It's not so much that he grows more skeptical of the humans   #More that he knows he's going to die I guess   #So he starts to finally put himself first instead of his humans   #I don't even know if I'm making sense anymore but let me continue   #In TIA he knows he's about to die   #So he remarks longingly about the humans that he loves so much   #Resigning himself to the fact he's going to die and leave Earth behind as a WIP   #But in Closing Time he's preoccupied with himself and his Farewell Tour   #Pretending that he doesn't care about his humans because he's going to leave them and pretending he doesn't care would make leaving them ...   #a lot easier   #But in the end he really does care and helps Craig save the earth from the Cybermen   #So I guess in true tl;dr versions   #The Doctor loves the Earth and the human race   #They're probably his favourite species